Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f575a2af389d728…

MALICIOUS

PDF

56.9 KB Created: 2020-08-13 18:42:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ac7f7fb3cc867ffcff6ba03b752685ae SHA-1: 559ff1bc0e65b5389e1af76d48a7a36ed0f41311 SHA-256: 5f575a2af389d728ec7308beddbe5026efb9e5b16981d94bf6f95c8e006d4ebd
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a significant number of embedded links, with one identified as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains a URL that matches the redirector heuristic, suggesting the document's primary purpose is to lure users to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.com/wb?keyword=vacuum%20distillation%20unit%20in%20refinery%20pdf
    • http://wizumexa.faustreading.com/uploads/1/3/1/8/131855997/vujokinalem_bebuzem.pdf
    • http://files.fishbowllabs.com/uploads/1/3/1/3/131378821/navalekizadex.pdf
    • http://fizitir.the100dayproject.org/uploads/1/3/0/9/130969762/e5349a5f19.pdf
    • http://files.scdsmke.org/uploads/1/3/1/8/131871433/jasadewatifofususuto.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/9545/7941/files/ditivadumewikoxi.pdf
    • https://cdn.shopify.com/s/files/1/0434/5777/3725/files/24917778407.pdf
    • https://cdn.shopify.com/s/files/1/0436/1060/3677/files/fozubi.pdf
    • https://cdn.shopify.com/s/files/1/0440/1774/6070/files/anti_discrimination_policy.pdf
    • https://cdn.shopify.com/s/files/1/0438/9902/7611/files/built_in_bookshelf_plans.pdf
    • https://cdn.shopify.com/s/files/1/0431/8186/7176/files/53410738335.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lurexemip.pdf
    • https://cdn.shopify.com/s/files/1/0435/8907/5099/files/vetanotukujuso.pdf
    • https://cdn.shopify.com/s/files/1/0429/5573/5199/files/loop_in_r.pdf
    • https://cdn.shopify.com/s/files/1/0433/6638/3768/files/mukuk.pdf
    • https://cdn.shopify.com/s/files/1/0438/3975/0294/files/40640262369.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/19252536586.pdf
    • https://cdn.shopify.com/s/files/1/0437/4354/3450/files/73181792617.pdf
    • https://cdn.shopify.com/s/files/1/0430/1163/7401/files/64636389125.pdf
    • https://cdn.shopify.com/s/files/1/0432/8954/2809/files/peketujorofivakelofakuka.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009b9d.bin
7abe5ab1ac42d07ade7844d934aa05ab48da77f5aed9faae4922103e6bec3105		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9B9D 5368 bytes
font_01_sfnt_off0000add6.bin
05e5e7ab7daabbdb396ad12fa566ce4c4be0d1812179545d8ffef2998ad47fbb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xADD6 11796 bytes

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